PHY133_Standing_Waves

PHY133_Standing_Waves - PHYSICS 133 EXPERIMENT NO. 8...

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PHYSICS 133 EXPERIMENT NO. 8 STANDING WAVES Introduction In this experiment we study standing waves on a long rubber band stretched between fixed supports. These standing waves are similar to those produced in a guitar string when it is plucked, except that in the present experiment, we will continuously drive them so that they will not die out. If one end of a long rubber band is subjected to forced periodic vibrations, traveling waves will propagate down the rubber band with velocity v = ( T / μ ) (1) where T is the tension in the rubber band and is the mass per unit (stretched) length of the rubber band. The wavelength λ is related to the frequency f of the driving force and the velocity of propagation v as λ = v / f. Waves reflecting off the far end of the rubber band interfere with incident waves, and for certain driving frequencies a stable pattern emerges, characterized by fixed points of destructive interference (nodes) and constructive interference (anti-nodes). The condition
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PHY133_Standing_Waves - PHYSICS 133 EXPERIMENT NO. 8...

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